wù / yǐ / lèi / jù / xǐ / huān / dú / shū / de / rén / cháng / cháng / huì / chéng / wéi / péng / you

物以类聚，喜欢读书的人常常会成为朋友。

Birds of a feather flock together; people who enjoy reading often become friends.